If yours is indeed the original blade, might want to order a new one from Fastlane. Not too expensive, and they DO need to be replaced in toto every few years. You will get a Bosch blade complete with "124" embossed on it.
Fastlane also sells inserts for about $5. You have to pull out the two stainless steel slats in the refill to get the old rubber out; make sure you hang onto them since replacement inserts don't come with them ...